Additional file 2.

Codon usage of pce-genes and adjacent genes encoded on the Pce genomic island in comparison to all strain SZ chromosomal genes using the codon adaptation index (CAI). Normalized CAI < 1.00 (red font) indicates a possible laterally acquired gene and is scored below genomic expected CAI at a 5% level of significance (genomes.urv.es/CAIcal/E-CAI).

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Wagner et al. BMC Genomics 2012 13:200   doi:10.1186/1471-2164-13-200